Shifting type head



July 28, 1925.. l

H. A. FOOTHORAP SHIFTING TYPE HEAD Filed AApril 30, 1925 Patented July28, 1925.

UNITED vSTATES PATENT OFFICE.

HARRY A. izoo'riioRAr, or HARRISBURG, 1nNNsYLvAN1A, AssrGNoR 'roELLIOTT- FISHER ooitrrAim,V A CORPORATION or DELAWARE.

SHIFTING TYPE HEAD.

Application med Aprn so, 1923. seriai No. 635,675.

Harrisburg, in the County of Dauphin andV State of Pennsylvania, hasinvented certain new and useful Improvements in Shifting Type Heads, ofwhichthefollowing is aspecification, reference being 'had therein tovthe accompanying drawing.

This invention relates to a shifting type head for typewriters of thatclass in which a type carrying head mounted on the type bar isautomaticallyl shifted to present different type, as for instance upperand lower case type, alternately in the printing position.

The object of the invention is to produce a simple, inexpensive andeiicient construction for movably mounting the head on the bar, forshifting the headto upper and lower case position and for securelyretaining the head in the selected position.

kThe preferred embodiment of the invention is shown in the accompanyingdrawings in which Fig. 1 is a skeleton view of a flat platen typewriterequipped with printing mechanism constructed in accordance with myinvention.

Figure 2 is a side elevation of the upper end of the type bar, theshiftable typefhead and parts associated therewith, one position of thehead being indicated in dotted lines.

Figure 3 is a section of the subject-matter of Figure 2.

Figure 4 is a detailed perspective view of a group including the typehead and the upper end f the type bar or arm.

In the drawings, 1 indicates the type ring of an Elliott-Fisher billingmachine supported below a horizontal deck 2Vwhich constitutes the bottomof a carriage 3 movable for letter spacing on a line space frame 4 whichadvances for line spacing over a stationary flat platen, the printingsurface 5 of which is indicated in Fig. 1. v

In the type ring 1 is mounted as usual, a series of up-standing typebars 6 at the upper end of each of which is mounted a pivoted type headcarrying upper and lower case types 8 and 9 movable alternatelyvintoprinting osition by the shifting of the head 7.

T e type bars 6 are moved down to the platen to print by keys 10connected to the type bars through intermediate connections 11 as shown,and said bars are retracted by retracting springs 12. The bar 6 isformed Awith a circular upper end 13 substantially conforming in contourto the hub 14 of the head7 which is reduced in thickness so as to' allowthe end 13 ofl the bar to lie within the side plane of the type head.

At the side of the hub 14 opposite the head .proper 7, a bifurcatedguide and stop 15 is 5 formed rintegral with the hub 'and issubstantially the same thickness as'the head 7. The head 7 and themember 15 are formed with angularly related 'stops 16 and 17 disposed toengage the front and rear edges Vof the bar 6 to limit the movement ofthe head 7 on its axis. This axis in the present instance is in the formof a pivot screw 18 having a head 19 imposed against the hub 14 and thenut 2O screwed on the opposite end of the screw and imposed against thecircular end of the type bar.

Pivoted to the head 7 in a plane above and in advance of the aXisthereof, in the normal position of the head, as indicated at 21a is anapproximately semi-circular link 21, the lower end of which is locatedin rear of the type bar at a point'below the head 7 and is attached toone end of a head retaining spring 22 extended along the bar 6 andattached at its lower end thereto as indicated at 23. The link isreceived within the bifurcated guide and is provided with an upstandingtrigger 24 which when intercepted during the printing stroke by a trip25 will cause the head 7 to be shifted from lower case to upper caseposition. Similarly. upon the retraction of the type bar the trigger 24will be intercepted by abuffer ring 26 which will cause the retractionof the head 7 to normal lower case position as the bar comes to rest.

It will now be observed by reference to Figs. 1 and 2 that the line oftension between the fixed point 23 and the pivoted connection 21abetween the link 21 and the head 7 will be located in advance of theaxis of the head in one position and at the kopposite side of said axisin the other position of the head. This will naturally result in thesecure retention of the head in either position by the spring 22 sincein one case the stop 16 will be held firmly against the front of thetype bar and in the other case the stop 17 will be held firmly againstthe rear of the bar.

It is thought that from the foregoing the construction contemplated bymy invention Will be clearly understood, but I reserve the right toeffect such variations thereof as may come fairly Within the spirit ofthe invention as defined in the appended claims.

What I claim is:

l. The combination with a type bar, of a type head pivoted thereon, a'link pivoted to the head and provided with a trigger, and a headretaining spring connected to the link.

2. The combination with a. type bar, of a type head pivoted thereon, alink pivoted to the head and provided With a trigger, means for guidingthe link, and a head retaining spring Connected to the link.

8. The combination With a type bar, of a type head pivoted thereon andprovided With printing typesfand a guide at opposite sides of its axis,a link received by the guide pivoted to the head and having a projeotingtrigger and a head retaining spring connected to the link.

4. The combination With a type bar, of a hub mounted at the upper end ofthe bar, a head and a guide extended from opposite sides of the hub andeoaeting With the bar to limit the movement of the head in oppositedirections, a link pivoted to the head and extended through the guide, ahead retaining spring oonneeted to the link, and a trigger extended fromsaid link.

5. The combination with a type bar with a type head pivoted thereon, ofa head retaining spring extended along the rear side of the bar and aconnection between said spring and the head, said Connection beingpivoted on and movable With the head to bring the line of tension ofsaid spring alternately at opposite sides of the axis of the head toretain the head in either of two positions` 6. 'Ihe Combination With atype bar, of a type head mounted thereon and having angularly stop facesand a guide, said stop faces eoacting With the bar to limit the movementof the head, a link pivoted to the head and extended through the guide,a

spring connected to the link and a trigger extended from said link, theeonneetion between the link and head being movable to present the lineof tension at opposite sides of the axis of the head.

In testimony whereof I hereunto affix my signature.

HARRY A. FOOTHGRAP.

